$highlight-color: #F90;
$div-width: 800px;
$div-height: 500px;
.selected {
  border: 1px solid $highlight-color;
  width: $div-width;
  height: $div-height;
}
button{
  width: 80px;
  height: 40px;
  text-align: center;
}
.button > button{
  background: red;
}
.button ~ div{
  color: aqua;
}
.button>section{
  color: red;
}
